초록 ▼

A photographic exposure control system automatically classifies ambient scene lighting conditions as normal, backlit or forelit and then selects an exposure parameter signal program that is appropriate for the indicated conditions. The system monitors a plurality of different portions of the scene a

A photographic exposure control system automatically classifies ambient scene lighting conditions as normal, backlit or forelit and then selects an exposure parameter signal program that is appropriate for the indicated conditions. The system monitors a plurality of different portions of the scene area with a multi-sensor array that detects both subject range and ambient light intensity. A comparison of range measurements identifies that scene area portion having the nearest subject therein as the subject area. Ambient light intensity measurements of subject and non-subject areas are compared to classify lighting conditions and select a corresponding one of normal, backlit and forelit signal programs which control operation of system components to vary the ratio of ambient to artificial light contribution to exposure for the indicated lighting conditions.

대표청구항 ▼

A photographic exposure control system for classifying ambient scene lighting conditions as normal, backlit or forelit and, thereafter, automatically selecting appropriate exposure parameters for the indicated conditions, said system comprising: means, including a shutter arrangement, responsive to

A photographic exposure control system for classifying ambient scene lighting conditions as normal, backlit or forelit and, thereafter, automatically selecting appropriate exposure parameters for the indicated conditions, said system comprising: means, including a shutter arrangement, responsive to exposure parameter signals for controlling transmission of image forming light from a scene area to a photosensitive recording medium during an exposure interval; means, operative during a pre-exposure interval, for emitting ranging signals toward the scene area, separately measuring reflected back portions of the said ranging signals from each of a plurality of selected different scene area portions to determine the distance range of subjects therein, comparing said range measurements, and providing a signal identifying the scene area portion having the nearest subject therein to designate said portion as the subject area; means, operative during said pre-exposure interval or during an initial portion of the exposure interval, for separately measuring the ambient light intensity in each of the selected different scene area portions and providing corresponding separate light intensity signals for each said portion; means responsive to said subject area identifying signal and said light intensity signals for comparing the subject area light intensity with the light intensity of non-subject areas and, as a result of the comparison, providing a signal classifying ambient scene lighting conditions as normal, backlit or forelit; means for storing normal, backlit and forelit exposure parameter signal programs; and means responsive to said classifying signal for selecting the appropriate one of said programs corresponding to said classifying signal and transmitting said selected program of signals to said means for controlling transmission of image forming scene light to said recording medium.